1. Gepner, D.: Phys. Lett.B199, 380 (1987)
2. Greene, B. R., Vafa, C., Warner, N. P.: Nucl. Phys.B324, 371 (1989)
3. Martinec, E.: In: V. G. Knizhnik Memorial Volume (Brink, L. et al. (eds.)). Phys. Lett.217B, 431
4. Dixon, L., Harvey, J., Vafa, C., Witten, E.: Nucl. Phys.B261, 620 (1985);B274, 285 (1986)
5. Kim, J., Park, C., Yoon, Y.: Calabi-Yau spaces and rescale invariantN=2 minimal superconformal theories, KAI preprint, 1989